Some of them could be saying..."What am I doing here?", some seem to be enjoying it,however, they all have a look on their faces that they'd rather be somewhere else than here. (and not one "Adam's Apple" showing in the bunch!)

I'll take a wild stab here; as both George and Martha Washington have significant Virginia histories, and George one specific to Winchester, I'm going to guess they're made up in Martha Washington garb, including what look like gray wigs. There's also a GW legend about apple trees - not as famous as the cherry tree one, but still.

Another shot from the series shows some of them in the same dresses but different hair.